Just keep messaging the ass on PSN, facebook, and keep calling him. There are a few sites that help you locate old friends by putting in name, address, and phone number but I've never used them so I don't know if they are reliable.
Here's one:
http://www.intelius.com/
e=mc^2

Gaming on: PS4 Pro, Switch, SNES Mini, Wii U, PC (i5-7400, GTX 1060)







